1e9560e1e5
utils/net_cmsg.c: In function 'cmsg_append':
utils/net_cmsg.c:82:23: error: pointer of type 'void *' used in arithmetic [-Werror=pointer-arith]
82 | msg->msg_control += cmsgspace;
| ^~
cc1: all warnings being treated as errors
Using void pointers in arithmetic operations is a GCC extension, it is
not supported by the standard. Because what is the size of a void ?
87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/****************************************************************************
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* net/utils/net_cmsg.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/socket.h>
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#include "utils/utils.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: cmsg_append
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*
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* Description:
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* Append specified data into the control message, msg_control and
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* msg_controllen will be changed to the appropriate value when success
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*
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* Input Parameters:
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* msg - Buffer to receive the message.
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* level - The level of control message.
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* type - The type of control message.
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* value - If the value is not NULL, this interface copies the data
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* to the appropriate location in msg_control, and modify
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* msg_control and msg_controllen.
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* If the value is NULL, just modify the corresponding value
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* of msg.
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* value_len - The value length of control message.
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*
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* Returned Value:
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* On success, a pointer to the start address of control message data,
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* the caller can copy the data in.
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* On failure, return NULL, because of msg_controllen is not enough
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*
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****************************************************************************/
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FAR void *cmsg_append(FAR struct msghdr *msg, int level, int type,
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FAR void *value, int value_len)
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{
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FAR struct cmsghdr *cmsg;
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unsigned long cmsgspace = CMSG_SPACE(value_len);
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FAR void *cmsgdata;
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if (msg->msg_controllen < cmsgspace)
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{
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return NULL;
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}
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cmsg = CMSG_FIRSTHDR(msg);
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cmsg->cmsg_level = level;
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cmsg->cmsg_type = type;
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cmsg->cmsg_len = CMSG_LEN(value_len);
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cmsgdata = CMSG_DATA(cmsg);
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if (value)
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{
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memcpy(cmsgdata, value, value_len);
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}
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msg->msg_control = (char *)msg->msg_control + cmsgspace;
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msg->msg_controllen -= cmsgspace;
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return cmsgdata;
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}
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